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Muscularis mucosae
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The muscularis mucosae comprises the outermost layer of the mucosa in the histological arrangement of the gastrointestinal tract. It is found in the walls of the gastrointestinal tract specifically from the esophagus to the upper portion of the rectum.
The muscularis mucosae clearly defines the border between the mucosa and the submucosa.
Structurally, it is composed of elastic fibers and thin layers of smooth muscle cells, generally arranged in an outer longitudinal and inner circular layer.
This arrangement keeps the mucosa and underlying glands in a constant state of gentle agitation which helps to expel contents of gastric glands and intestinal crypts, respectively. It also enhances contact between the epithelium and the contents of the lumen.
| Terminology |
English: Muscularis mucosae Synonym: Muscular layer of mucosa Latin: Lamina muscularis mucosae |
| Definition | The muscularis mucosae comprises the outermost layer of the mucosa in the histological arrangement of the gastrointestinal tract. |
Learn more about the histological arrangement of the stomach with the following study unit:
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